Monthly Weather Bulletin
Malaysia in generally still experiencing phase of Southwest Monsoon which is characterized by surface winds that blow regularly from the west, and also relatively drier condition than the other seasons. During the Southwest Monsoon, the atmosphere is relatively stable. This situation will result in most areas across the country will have more days without rain compare to rainy day, and in turn will lead to drier weather conditions.
Most areas in Peninsular Malaysia experienced hot and dry weather except in the southern and coastal areas of the east coast. Selangor, Perak, Southern Kedah, interior areas of Kelantan, Terengganu and Pahang received rainfall less than 100 mm with the percentage of anomalies less than 60% below the average.
In Sarawak, most areas received 20% below the average of rainfall. Sibu and Miri Divisions received less than 100 mm of rainfall, a reduction of more than 60% from average.
The same weather condition occurred in Sabah. Most divisions received below average rainfall except Pitas and Sandakan which received average rainfall. Semporna and Tawau experienced a reduction of 60% below the average.
For Peninsular Malaysia, the lowest number of rainy days is 6 days as recorded at Meteorological Station Kuala Terengganu meanwhile the highest number of rainy days is 23 days as recorded at Meteorological Station Cameron Highlands. For Sarawak, range of raindays is between 17 days as recorded at Meteorological Station Bintulu and 23 days as recorded at Meteorological Station Kapit. Number of raindays of Sabah is ranged between 8 days as recorded at Meteorological Station Sandakan and 23 days as recorded at Meteorological Station Labuan.
In generally, almost all areas have recorded the temperature higher than long term temperature for May. Average monthly temperatures for the lowlands areas are ranged from of 24.8°C as recorded at Meteorological Station Ranau and 30.1°C as recorded at the Meteorological Station Petaling Jaya. Meanwhile, the largest deviation is 2.4°C as recorded at Meteorological Station Subang.
The average of minimum temperature for the lowland areas ranged from 20.6°C recorded at Meteorological Station Ranau to 26.8°C recorded at Meteorological Station Petaling Jaya and Bayan Lepas. The lowest temperature recorded for the last month is 18.7°C recorded at Meteorological Station Ranau.
The average of maximum temperature ranged from 31.2°C recorded at Meteorological Station Ranau to 35.4°C recorded at Meteorological Station Temerloh for the lowland areas. The highest temperature for the month recorded at Meteorological Station Temerloh with readings of 37.3°C.
The single station for the highlands areas is Meteorological Station Cameron Highlands recorded the temperature from 15.0°C to 25.4°C and the mean temperature is 19.4°C.
About 25 meteorological stations has recorded the solar radiation readings in June 2014 and the readings is higher than average. The average of solar radiation for the lowland areas is ranged from 12.94 MJm-² as recorded at Meteorological Station Bayan Lepas to 29.31 MJm-² as recorded at Meteorological Station Tawau. The average of solar radiation for the highland areas is 17.00 MJm-² which is recorded at Meteorological Station Cameron Highlands. The solar radiation is affected by cloud cover, where the less of the cloud coverage given the high readings otherwise the coverage of cloud is more the readings of solar radiation is low. The largest positive deviation is + 4.97 MJm-² at Meteorological Station KLIA Sepang and the largest negative deviation is – 4.33 MJm-² at Meteorological Station Bayan Lepas.
The average of evaporation rates for lowland areas is varied from 3.2 mm/day recorded at Meteorological Station Kluang to 5.5 mm/day recorded at the Meteorological Station Kuala Terengganu. The main factors that affect the rate of evaporation are the dry air and the surface temperature. When the surface temperatures is high and air conditions is dry will given the high readings of evaporation rates. The biggest positive deviation recorded at Meteorological Station Sitiawan is +1.4 mm/day. Meanwhile, the average daily evaporation rate recorded at the Meteorological Station Cameron Highlands is 2.4 mm/day, and the deviation is 0.4 mm/day.
FIGURE 1 : Rainfall Map for Malaysia
FIGURE 2a : Mean Monthly Temperature
FIGURE 2b : Mean Monthly MaximumTemperature
FIGURE 2c : Mean Monthly MinimumTemperature
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